Fix -MaximumRetryCount description in Invoke-WebRequest.md

[igoragoli]

PR Summary

-MaximumRetryCount's description stated that -RetryIntervalSec specified the number of
retries, which is incorrect. I modified the description accordingly.

PR Checklist

• Descriptive Title: This PR's title is a synopsis of the changes it proposes.
• Summary: This PR's summary describes the scope and intent of the change.
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• Style: This PR adheres to the style guide.

[learn-build-service-prod]

Learn Build status updates of commit cc03518:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/7.4/Microsoft.PowerShell.Utility/Invoke-WebRequest.md	✅Succeeded	View (powershell-7.4)

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[github-actions]

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[learn-build-service-prod]

Learn Build status updates of commit a2993a9:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/7.4/Microsoft.PowerShell.Utility/Invoke-RestMethod.md	✅Succeeded	View (powershell-7.4)
reference/7.4/Microsoft.PowerShell.Utility/Invoke-WebRequest.md	✅Succeeded	View (powershell-7.4)
reference/7.5/Microsoft.PowerShell.Utility/Invoke-RestMethod.md	✅Succeeded	View (powershell-7.5)
reference/7.5/Microsoft.PowerShell.Utility/Invoke-WebRequest.md	✅Succeeded	View (powershell-7.5)

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel